David m



(No Model.)

DMSMYTHQ BOOK SEWING MAGHINE.

No. 274,986. Patented Ap1-.3,1883.

4 fait UNITED t STATES.

PATENT Carien.

DAVID M. SMYTH, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE SMYTH MANUFACTURING COMPANY, OF SAME PLACE.

i"BooK-siawnie MACHINE.

SPECIFICATION forming part of Letters Patent No. 274,986, dated April 3, 1883.

` Application filed July 8, 1882. (No model.)

4To all whom it may concern Be it known that I, uDAVID M. SMYTH, ot' Hartford, iu the county of Hartford and State .ofl'ConnecticuQ have invented an Improve- 5 nient in BookSewing Machines, ot' which the following is a specification.

In several Letters Patent heretoforeiob'f cember 13, 1881, for the interlocking ot" the looped threads in the middle of the sewing. zo In my present invention I make use ot'looping-needles instead of eye-pointed needles, and

I draw the thread into and through the folded `signatures and loop one stitch into the neXtiu two lines of loops at the respective places z5 where the needles draw out.

In' the drawings, Figure 1 is an elevation of a pair ot' looping-needles. Fig. 2 is a plan ot' the same and the thread-guide. Fig. 3 is a diagram representing the signatures, needles,

3o and interlooping of the threads. Fig. f1 is a view in enlarged sizeof the hook end ot' the ueedle,and Fig. 5 illustrates the manner in which a loop ot' thread is shed ot the needle around the loop held by the hook end ot' the 3,5 needle.

1 have shown one pair ot needles. They work with one thread. It is to be understood that there may be two, three, or more pairs of needles, according to the size ot' thesheets that 4o are being sewed together. Each needle l is made as a semicircle, or nearly so, with a radial shank secured into the shalt 7c, and these shafts are in suitable supports and receive partial rotation to movethe needle into and out ot' the folded signatures at the proper times. The sheetsc are to be grooved or channeled across the back folds at the proper places, and the sheets are placed i n succession upon sheetholding arms that are moved up to the place 5o of sewing to carry and hold the sheet while .being sewed, and thon such sheet-holder is withdrawn and another sheet brought up to place upon the nextarm. All these devices and their modes of operation are fully set forth in my aforesaid Letters Patent, and reference is'herehy made to them for a more full description.

. The needles I make use of in the presentinventiou "ary from those before employed by me to the extent thatinstead of having an eye 6o near the point they are each made with a spring-hook similar to knitting-machine needles, iu order that the hook may receive one thread into it and cast the previous loop ott' over the new one, as in knitting. I prefer to make the hook of a twisted shape similar to that represented in Fig. 4 in larger size. In this figure the hook is curved around from the front side of the needle toward the back, so that the point ot' the hook may come into the 7o triangular space in the loopl of thread that passes around the needle at the back thereof to the previously-served signature, so that the point ofthe hook, as the needle rises to cast oft' the previous loop, may pass up into this" 75 open part ot' the loop and insure the casting oft' of such loop. The thread that is employed passes down through an eye or fork at the end of the vibrator a5. This vibrator is moved trst one way at `one stitch, and then the other 8o way at the next stitch, by any suitable connection to the moving parts ot' the machine.,A In Fig. 1, for greater clearness, this v'ibratoris shown simply as an eye for the thread to pass through.l

The sewing operation is as follows: The left-ha1id needle l of the pair of needles is moved down and through the saw-cutsof one folded sheet or signature, and the hooked point of l projects up through the middle saw- 9o cut of the signature, the vibrator n.5 at this time having been to the left. This vibrator nt this moment is moved to the right, drawing the thread around the needle to insure the entrance of the thread into the hook of the needle. Said needle now draws back through and out of the signature, drawing with it the thread double. The next folded signature is now brought up to place, and the right-hand needle passed through its fold, and thehooked roo point emerges through the middle saw-out, and the thread, having been held to the right by the vibrator a5, is now moved to the left, wrappin g the thread around the hook, and the needle draws back, pulling the thread through the signature; another or third folded sheet is brought up to place, the left-hand needle descends through the same, the loop of thread from the rst signature being around its shank, the thread is again taken as before,and as the needle draws back out ot the signature the previous loop from the iirst signature is cast ott' the needle over the loop of thread of the third signature, and when the fourth signature is applied and sewed the loop of the second signature is cast oit' the needle over the. thread ot' this fourth signature, and so on.

It is to be understood that the same operations are performed by each pair of needles,

and that there may be any desired number of pairs employed, there being one thread and one vibrator to each pair of needles.

The threads, as looped together iu the signatures, oceupyt'ne positionsindieated in Fig. 3, the threads passing from one signature to the next in the middle portions, and being nearly straight from end to end, and being interlooped similar to chain-stitches at the outer parts of the lines of sewing.

1f desired, a transverse binding-cord may be drawn into the middle channel or saw-cut beneath the threads. This may be done by employing a needle, as at o in my aforesaid patents, or by any other suitable means.

I claim as my invention- 1. The combination, in a book-sewing machine, of a semieircular needle having a hook near the end, and means, substantially as described, for partially rotating the needle, a support for the notched signatures, and means, substantially as described, for presenting the thread to the hook, so that the thread is drawn into the signature and looped, substantially as speeilied.

2. The combination, in a bookvsewing machine,ot` two semieircular needles,havinghooks near the points and standing in opposite directions, with a vbratin g th read-carrier to lay the thread around the needles alternately, sul)` stantially as set forth.

3. The method herein specified ot' sewing books, consisting in drawing the thread in opposite directions alternately in contiguous sheets and looping the threads ofthe alternating sheets at the respective ends of the lines of sewing, substantially as set forth.

Signed by me this 20th day of June, A. D. 1882. t

DAVID M. SMYTH. Witnesses:

CHARLEs E. GRoss, FRANK E. HYDE. 

